Feed-lever connection for drills.



A. J. GIFPORD.

FEED LEVER CONNECTION FOR DRILLS.

APPLICATION FILED JULY 11, 1910.

Patented Dec. 12, 1911.

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ALBERT J'. GIFFORD, OF WORCESTER, MASSACHUSETTS, ASSIGNOR T0 W. H. LELAND 8:. COMPANY, OF WORCESTER, MASSACHUSETTS, A FIRM.

FEED-LEVER CONNECTION FOR DRILLS.

Original application filed January 18, 1909, Serial No. 472,821.

Specification of Letters Patent.

Serial No. 571,300.

To all whom it may concern. 1

Be it known that I, ALBERT J. Girrono, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Feed-Lever Connection for Drills, of which the following is a specification.

This is a division of my application for Letters Patent Serial No. 472,821, filed J an. 18, 1909.

This invention relates particularly to sensitive drills, but certain features thereof are capable of general use.

The principal object of the invention is to provide a simple means whereby the feed lever for operating a drill spindle can be adjusted around to a convenient angle so that it can be operated more efiiciently in practice than has been the case heretofore; and to provide improvements in certain features of construction as will appear hereinafter.

Reference is to be had to the acco1npanying drawings in which- Figure 1 is a side view of the upper part of a sensitive drilling machine showing a practicable form of the invention applied thereto; Fig. 2 is a sectional view on the line 22 of Fig. 1, on an enlarged scale; and Fig. 3 is a front elevation of a portion of the same.

In the application of this invention to a sensitive drilling machine, the frame 10 thereof supports a pulley 19 and spindle 20, the latter being supported in vertical posi- As is usually the case in sensitive drills the frame 10 is shown as provided with a bracket 35 adapted to slide up and down and carrying therein a pinion 36 meshing with a rack 37 on the quill 38 connected with the spindle 20. In this case the pinion is hollow and a rod 40 passes through it. This is secured at one end by a nut 41 or the like and is provided with an integral head 42 at the other end. This rod and head are normally capable of turning independent of the pinion, but the pinion has integrally connected with it a tooth wheel 43, and the head has located in a slot therein a pawl 44, adapted .to project into the teeth of the wheel 43 and to hold the parts 42 and 43 in fixed relation to each other. A spring 45 normally holds the parts in this position. This pawl is provided with a perforation through which passes a slidable feed lever 46 which is adapted to be fixed to the pawl by a thumb screw 47 or the like. This lever can be moved back and forth by loosening the thumb screw in the usual way. If however, it is turned on its own axis in one direction, the pawl 44, will be drawn out of the teeth of toothed wheel 43 and feed lever 46 can be turned at will without turning the pinion and without raising or lowering the rack. In this way the workman can move the feed lever into a convenient position for operation, whatever the elevation.

While I have illustrated and described a preferred embodiment of the invention, I am aware that many modifications can be made therein by any person skilled in the art, without departing from the scope of the invention as expressed in the claims, therefore, I do not wish to be limited to all 'the features of construction shown and described or to the application of all features of the invention to drills, but

What I do claim is 1. In a machine of the character described, the combination of a drill spindle, a support for the drill spindle, a quill and rack therefor, a pinion for the rack, a feed lever for operating the rack and pinion, and means connected with the feed lever, whereby when it is turned on its axis it will be disconnected from the pinion and can be turned independently thereof on a transverse axis.

2. In a machine of the character described, the combination of a drill spindle, a quill and rack therefor, a pinion meshing with the rack, a support for the pinion, a feed lever carried by said support for turning the pinion, and means whereby when the feed lever is turned on its axis it will be disconnected from the pinion.

3. In a machine of the character described, the combination of a support, a pinion rotatable therein, a rack meshing with the pinion, a spindle movable with the rack, a toothed wheel connected with the pinion and rotating therewith, a pawl normally engaging a tooth of the wheel, and a feed lever connected with said pawl and adapted to turn the wheel and pinion when the feed lever is turned on the axis of the wheel and pinion, said pawl having means whereby, when the feed lever is turned on its own axis in one direction, the pawl will be released from the wheel and the feed lever can be turned independently thereof.

4. In a machine of the character clescribed, the combination of a rack, a spindle movable with the rack, a pinion, a rod passing through the pinion and rotatable independently thereof, a head on the rod, a feed lever supported by said head, a spring pressed pawl on the head fixed to the feed lever, and a wheel connected with the pinion having teeth adapted to receive said pawl, said pawl being movable from the teeth whereby the feed lever and rod can be turned without moving the rack.

5. In a machine of the character described, the combination of a support, a pinion rotatable therein, a rack meshing with the pinion, a spindle movable with the rack, a rod concentric with the pinion and rotatable independently thereof, a toothed wheel connected with the pinion and rotatable therewith, a radial feed lever supported at the end of said rod, a springpressed pawl supported on said rod and normally engaging the teeth ofsaid wheel, said pawl being removable from the teeth thereof by the movement of said lever in one direction on the rod while remaining in radial position thereon.

In testimony whereof I have-hereunto set my hand, in the presence of two subscribing witnesses.

ALBERT J. GIFFORD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of iatents,

Washington, D. G. 

